Some things Ive seen done with compromised systems:
A porn of a guy boffing his gf that he put on his computer.
Someone useing people on georgia techs network that weren't running firewalls to attack the white house.
Some things an adsl router is not going to stop...
Any program that wants to access the internet(for example trojan) unless you specifically define policies.
A adsl routers generally don't even technically have a firewall. Its considered a nat box. Nat (network address translation) can be secure in that it only opens those out going that go out, but it isn't what Id trust my network too.
The software programs work pretty well depending on which you use. Black ice is the best of the bunch.
You'll have to trust me on this one. This is part of my college specialization. It is also something I have been paid in the past for my advice.
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